1、ECMA ECMA8345 90 3404593 0002432 3 - _- ECMA E UR O PEAN CO IIIPUTER MAN U FACTURE RS ASS OCIATIOH STANDARD ECMA-145 8mm WIDE MAGNETIC TAPE CARTRIDGE FOR INFORMATION INTERCHANGE - HELICAL SCAN RECORDING - December 1990 3404593 0002433 3 E - . BRIEF HISTORY ECMA have produced a series of ECMA Standar
2、ds for cassettes and cartridges containing magnetic tapes of different width and characteristics. ECMA-34 (1976) : ECMA-46 (1976) ECMA-79 (1985) : ECMA-98 (1985) : ECMA-120 (1987) : ECMA-139 (1990) : ECMA-146 (1990) : The first five of these media were designed for the digital recording of data for
3、storage and processing in data processing systems. In recent years, other magnetic media, originally developed for audio and video applications, have been considered for use in data processing applications for storage as well as for information interchange. The recording method known as helical scan
4、 recording, together with new types of magnetic tapes, allows to achieve capacities of more than 1 gigabyte of user data. Upon request of Committee ISOIIECIJTClISCll Standard ECMA-139 and ECMA-146 have been contributed to ISOIIEC for adoption as International Standards under the fast-track procedure
5、. The present Standard is the first standard for 8 mm wide magnetic tape cartridge. Also upon request of ISO/IEC/JTCl/SCll, this ECMA Standard has been contributed to IS0 for adoption as an International Standard under the fast-track procedure. Data Interchange on 3,81 mm Magnetic Tape Cassette (32
6、bpmm, Phase Encoded) Data Interchange on 6,30 mm Magnetic Tape Cartridge (63 bpmm, Phase Encoded) Data Interchange on 6,30 mm Magnetic tape Cartridge Using IMFM Recording at 252 ftpmm Data Interchange on 6,30 mm Magnetic Tape Cartridge Using NRZ1 Recording at 394 ftpmm - Streaming Mode Data Intercha
7、nge on 12,7 mm 18-Track Magnetic Tape cartridges 3,81 mm Wide Magnetic Tape Cartridge for Information Interchange - Helical Scan recording - DDS Format 3,81 mm Wide Magnetic Tape Cartridge for Information Interchange - Helical Scan recording - DATADAT Format Adopted as an ECMA Standard by the Genera
8、l Assembly of 13th December 1990. ECMA ECMAxL45 90 m 3404593 0002434 5 m -i- SECTION I - GENERAL 1. SCOPE 2. CONFORMANCE 3. REFERENCES 4. DEFINITIONS TABLE OF CONTENTS 4.1 4.2 4.3 4.4 4.5 4.6 4.7 4.8 4.9 4.10 4.1 1 4.12 4.13 4.14 4.15 4.16 4.17 4.18 4.19 4.20 4.2 1 4.22 4.23 4.24 AC Erase Average Si
9、gnal Amplitude Azimuth Back Surface Bit Cell Byte Cartridge Cyclic Redundancy Check (CRC) Character Error Correcting Code (ECC) Flux Transition Position Flux Transition Spacing Magnetic Tape Master Standard Reference Tape Physical Beginning of Tape (PBOT) Physical End of Tape (PEOT) Physical Recordi
10、ng Density Secondary Reference Amplitude Secondary Reference Field Secondary Standard Reference Tape Standard Reference Current (Ir) Test Record i ng Cur rent Tone Track Typical Field 5. ENVIRONMENT AND SAFETY 5.1 Testing Environment 5.2 Operating Environment 5.3 Storage Environment 5.4 Transportati
11、on 5.5 Safety Page 1 1 1 1 1 1 1 1 1 1 1 1 1 2 2 2 2 2 2 2 2 2 2 2 2 3 3 3 3 3 ECHA ECMA*145 90 E 3404593 0002415 7 ., 5.6 Flammability SECTION II - REQUIREMENTS FOR THE CASE 6. DIMENSIONAL AND MECHANICAL CHARACTERISTICS OF THE CASE 6.1 6.2 6.3 6.4 6.5 6.6 6.7 6.8 6.9 6.10 6.11 6.12 6.13 6.14 6.15 6
12、.16 6.17 6.18 6.19 6.20 6.21 General Overall Dimension ( figure 3 ) Holding Areas Cartridge Insertion Window ( figure 1 ) Loading Grips ( figure 3 ) Label Areas ( figure 3 ) Datum Areas and Datum Holes ( figures 4, 5 and 6 ) Support Areas Recognition Holes ( figures 5, 6 and 7 ) Write-inhibit Hole (
13、 figures 6 and 7 ) Pre-positioning Surfaces ( figures 3 and 5 ) Cartridge Lid ( figures 3 and 8 ) Cartridge Reel Lock ( figure 11 ) Reel Access Holes ( figure 5 ) Interface between the Reels and the Drive Spindles ( figures 17 and 18 ) Light Path ( figures 5, 7, 15 and 16 ) Position of the tape in t
14、he case ( figure 16 ) Tape Path Zone ( figures 16 and 17 ) Tape Access Cavity ( figure 5 ) Tape Access Cavity Clearance Requirements ( figure 19 ) SECTION III - REQUIREMENTS FOR THE UNRECORDED TAPE 7. MECHANICAL, PHYSICAL AND DIMENSIONAL CHARACTERISTICS OF THE TAPE 7.1 7.2 7.3 7.4 7.5 7.6 7.7 7.8 7.
15、9 7.10 Materials Tape Length 7.2.1 Magnetic Tape 7.2.2 Leader and Trailer Tapes 7.2.3 Splicing Tape Width Discontinuities Thickness 7.5.1 Thickness of Magnetic Tape 7.5.2 Longitudinal Curvatu re Cupping Coating Adhesion Layer-to-Layer Adhesion Tensile Strength Thickness of Leader and Trailer Tape 4
16、4 4 4 5 5 5 6 6 6 7 8 8 9 9 IO 11 12 12 13 13 14 14 14 32 32 32 32 32 32 32 32 32 32 32 32 32 33 33 34 34 ECMA ECMA*345 90 3404593 O002436 9 m - - 7.10.1 Breaking Strength 7.10.2 Yield Strength 7.1 1 Residual Elongation 7.12 7.13 Tape Winding 7.14 Light Transmittance of Tape Electrical Resistance of
17、 the Surface 8. MAGNETIC RECORDING PERFORMANCE 8.1 Test Conditions 8.2 Typical Field 8.3 Signal Amplitude 8.4 Resolution 8.5 Narrow-band Signal-to-noise Ratio 8.5.1 Requirement 8.5.2 Proced Ure 8.6 Ease of Erasure 8.7 Tape Quality 8.7.1 Missing Pulses 8.7.2 Missing Pulse Zone 8.8 Inhibitor Tape 9. F
18、ORMAT 9.1 General 9.2 Infoimation Matrix 9.2.1 Loading of the information Matrix 10. METHOD OF RECORDING 10.1 Physical Recording Density 10.1.1 10.1.2 10.1.3 Rate of Change Long-Term Average Bit Cell Length Short-Term Average Bit Cell Length 10.2 Bit Shift 10.3 Read Signal Amplitudes 10.3.1 Amplitud
19、e of Data Signals 10.3.2 Amplitude of Servo Signals 10.3.3 Signal Amplitude on an Analogue Tape Mark Track 10.4 Erasure 11. TRACK GEOMETRY 11.1 Track Positions 11.2.1 Average Track Pitch 1 1.2.2 Adjacent Track Pitch 35 35 35 35 36 36 36 36 37 37 37 37 37 37 37 37 37 38 38 38 38 38 39 43 43 43 43 43
20、44 44 44 44 44 44 45 45 46 46 - iv - ., 11.3 Track Width 11.4 Track Angle 11.5 Linearity of Track Edges 11.6 Azimuth 12. FORMAT OF AN INFORMATION TRACK 12. I Channel Bit 12.2 Information Segment 12.2.1 Bit Synchronization Field 12.2.2 Information Segment Number 12.2.3 Information Segment field 12.3
21、Information Block 12.4 Information Zone 12.5 Servo Zone 12.6 Information Tracks 12.6.1 Format ID Track 12.6.2 Data Track 12.6.3 Tape Mark Track 12.6.4 Splice Track 13. TAPE MARK 13.1 Description 13.2 Long Tape Mark 13.3 Short Tape Mark 13.3.1 Normal Short Tape Mark 13.3.2 Alternative Short Tape Mark
22、 14. ID INFORMATION 14.1 14.2 14.3 14.4 14.5 14.6 14.7 14.8 Column 00, Row O0 14.1.1 14.1.3 14.1.4 Column 00, Row O1 Column 00, Row 02 Column 00, Row 03 Column 00, Row 04 Column 00, Rows 05,06 14.6.1 Row 05 14.6.2 Row 06 Column 00, Row 07 Column 00, Rows 08,09,10 14.8.1 14.8.2 Block Type - Data Bloc
23、k Block Type - Format ID Block Type - Pad Block Block Type - Data Block Block Type - non-Data Block 46 46 46 46 46 46 46 47 47 47 48 49 49 50 50 51 51 51 51 51 52 52 52 52 52 52 52 53 53 53 53 53 53 53 53 53 53 54 54 54 -v- 14.9 Column 00, Rows 11,12,13 15. REWRITTEN INFORMATION BLOCKS 16. PHYSICAL
24、TAPE FORMAT 16.1 initial Erased Area 16.2 16.3 16.4 Post Data Erased Area Logical Beginning of Tape Area (LBOT Area) Usable Area of the Tape APPENDIX A - MEASUREMENT OF LIGHT TRANSMITTANCE OF TAPE AND LEADERS APPENDIX B - MEASUREMENT OF BIT SHIFT APPENDIX C - REPRESENTATION OF 8-BIT BYTES BY IO-BIT
25、PATTERNS APPENDIX D - RECOMMENDATIONS FOR TRANSPORTATION APPENDIX E - INHIBITOR TAPE 54 54 55 55 56 56 56 57 61 65 69 71 - ECMA ECNA*l45 - 90 E 3404593 0002419 4 E -1- SECTION I - GENERAL 1. 2. 3. 4. 4.1 4.2 4.3 4.4 4.5 4.6 4.7 4.8 SCOPE This ECMA Standard specifies the physical and magnetic charact
26、eristics of an 8 mm wide magnetic tape cartridge to enable interchangeability of such cartridges: It also provides a format and recording method, thus allowing, together with Standard ECMA-13 for Magnetic Tape Labelling, full data interchange by means of such magnetic tape cartridges. CONFORMANCE A
27、magnetic tape cartridge conforms to this ECMA Standard if it satisfies all mandatory requirements specified herein. The tape requirements shall be satisfied throughout the extent of the tape. REFERENCES ECMA- 13: ECMA- 129: IS0 1302 IS0 R527: File Structure and Labelling of Magnetic Tapes for Inform
28、ation Interchange. Safety of Information Technology Equipment(1TE) Technical Drawings - Method of Indicating Surface Texture on Drawings Plastics - Determination of Tensile Properties DEFINITIONS For the purpose of this Standard, the following definitions apply. AC Erase A process of erasure utilizi
29、ng alternating fields of decaying level. Average Signal Amplitude The average peak-to-peak value of the signal output of the read head measured over a minimum of 1,40 mm, exclusive of missing pulses. Azimuth The angular deviation, in degrees of arc, of the recorded flux transitions on a track from t
30、he line normal to the track centreline. Back Surface The surface of the tape opposite to the magnetic coating used to record data. Bit Cell A distance along the track allocated for the recording of a Channel bit. Byte An ordered set of bits acted upon as a unit. Cartridge A case containing magnetic
31、tape stored on twin spools. Cyclic Redundancy Check (CRC) Character A character used for error detection. 4.10 4.1 1 4.12 4.13 4.14 4.15 4.16 4.17 4.18 4.19 4.20 A mathematical procedure yielding bytes used for the detection and correction of errors. Flux Transition Position That point on the magnet
32、ic tape that exhibits the maximum free-space flux density normal to the tape surface. Flux Transition Spacing The distance along a track between successive flux transitions. Magnetic Tape A tape that accepts and retains magnetic signals intended for input, output, and storage of data for information
33、 processing. Master Standard Reference Tape A tape selected as the standard for amplitude, Typical Field and Resolution. NOTE I The Master Standard Reference Tape has been established by the SONY Corporation. Physical Beginning of Tape (PBOT) The transition from the tape leader to the opaque area of
34、 the splice by which the translucent leader tape is joined to the magnetic tape. Physical End of Tape (PEOT) The transition from the opaque area of the splice to the translucent trailer tape. Physical Recording Density The number of recorded flux transitions per unit length of track, e.g., flux tran
35、sitions per millimetre (ftpmm) . Secondary Reference Amplitude The Average Signal Amplitude from the Secondary Standard Reference Tape when it is recorded with the Test Recording Current at 2126 ftpmm. Secondary Reference Field The Typical Field of the Secondary Standard Reference Tape. Secondary St
36、andard Reference Tape A tape the performance of which is known and stated in relation to that of the Master Standard Reference Tape. NOTE 2 Secondary Standard Reference Tapes can be ordered under the Part Number RSE-5001, uniil the year 2001, from the Sony Corporation, Magnetic Product Group. Daia M
37、edia Sales Division, 6-7- 35 Kitashinagawa, Shinagawa-ku, TOKYO 141, Japan (Tel: +81 3-448-3126, Fax: 4-81 3-447- 4378, Tlx: SONYCORPJ22262) It b intended that these be used for calibrating Tertiary Reference Tapes for use in routine calibration. Standard Reference Current (Ir) The current that prod
38、uces the Secondary Reference Field. I- -. 4.21 4.22 4.23 4.24 5. 5.1 5.2 5.3 ECMA ECMA*l45 70 W 3404573 0002423 2 = . - -3- Test Recording Current The current that is 1,5 times the Standard Reference Current. Tone A signal recorded at 98 ftpmm. Track A diagonally positioned area on the tape along wh
39、ich a series of magnetic transitions may be recorded. Typical Field In the plot of the Average Signal Amplitude against the recording field at the physical recording density of 2126 ftpmm, the minimum field that causes an Average Signal Amplitude equal to 90% of the maximum Average Signal Amplitude.
40、 ENVIRONMENT AND SAFETY The conditions specified below refer to ambient conditions immediately surrounding the cartridge. Cartridges exposed to environments outside these limits may still be able to function usefully; however, such exposure may cause permanent damage. Testing Environment Unless othe
41、rwise specified, tests and measurements made on the cartridge to check the requirements of this standard shall be carried out under the following conditions. Temperature: 23 OC k 2 OC Relative Humidity: 40 % to 60 % Conditioning period before testing: 24 hours Operating Environment Cartridges used f
42、or data interchange shall be capable of operating under the following conditions: Temperature: 5 OC to 45 OC Relative Humidity: 20 % to 80 % Wet Bulb Temperature: 26 OC max There shall be no deposit of moisture on or in the cartridge. Conditioning before operating: If a cartridge has been exposed du
43、ring storage and/or transportation to a condition outside the above values, before use the cartridge shall be conditioned in the operating environment for a time at least equal to the period during which it has been out of the operating environment, up to a maximum of 24 hours. NOTE 3 Rapid variaiio
44、ns of iemperature should be avoided. Storage Environment For long-term or archival storage of cartridges the following conditions shall be observed: Temperature: 5 OC to 32 OC Relative Humidity: 20 % to 60 % Wet Bulb Temperature: 26 OC max -4- ., ? The stray magnetic field at any point on the tape s
45、hall not exceed 4000 Nm. There shall be no deposit of moisture on or in the cartridge. 5.4 Transportation Recommended limits for the environment to which a cartridge may be subjected during transportation, and the precautions to be taken to minimise the ,possibility of damage, are provided in Append
46、ix D. 5.5 Safety The cartridge and its components shall satisfy the requirements of ECMA-129. 5.6 Flammability The cartridge and its components shall be made from materials which, if ignited from a match flame, do not continue to burn in a still carbon dioxide atmosphere. SECTION II - REQUIREMENTS F
47、OR THE CASE Figure 1 Figure 2 Figure 3 Figure 4 Figure 5 Figure 6 Figure 7 Figure 8 Figure 9 Figure 10 Figure 11 Figure 12 Figure 13 Figure 14 Figure 15 Figure 16 6. 6.1 Gen er a 1 DIMENSIONAL AND MECHANICAL CHARACTERISTICS OF THE CASE The case of the cartridge shall consist of: - an upper half, - a
48、 lower half, - a lid pivotally mounted on the upper half. in the drawings, an embodiment of the cartridge is shown as an example. is a perspective view of the cartridge seen from the top. is a perspective view of the cartridge seen from the bottom. shows the top side with the lid closed using third
49、angle projection. shows the bottom side, datum and support areas. shows the bottom side with the lid removed. shows the enlarged view of the datum and recognition holes. shows the cross-sections through the light path holes, the recognition holes and the write-inhibit hole. shows details of the lid when closed, rotating and open. shows the details of the lid release insertion channel, shows the lid lock release requirements. shows the reel lock release requirements. shows the reel unlock force direction. shows the lid release force direction. shows the lid open
